y= ax + c The vertex of the parabola in the xy-plane above is (0, c). Which of the following is true about the parabola with the equation y = - ax + b)² + c? The vertex is (-6, c) and the graph opens downward. B The vertex is (-6, c) and the graph opens upward. The vertex is (b, c) and the graph opens downward. D The vertex is (b, c) and the graph opens upward.

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